For a septic tank under 1,000 gallons, the tank itself will likely cost between $500 and $1,200, according to HomeAdvisor, while a tank that’s 1,200 gallons or more is more likely to cost $1,200 ...

For a house with five or more bedrooms, you’ll most likely want a 1,500-gallon tank, and that will cost $15,000 to $25,000. The cost to replace an existing septic system is $3,000 to $7,000 ...

For a house with five or more bedrooms, you'll most likely want a 1,500-gallon tank, and that will cost $15,000 to $25,000. The cost to replace an existing septic system is $3,000 to $7,000 ...

For a house with five or more bedrooms, you'll most likely want a 1,500-gallon tank, and that will cost $15,000 to $25,000. The cost to replace an existing septic system is $3,000 to $7,000 ...